【1379】计算两点间的距离（多实例测试）

#include <stdio.h>
int main()
{double a,b,c,d;while(~scanf("%lf %lf %lf %lf",&a,&b,&c,&d)){printf("%.2lf\n",sqrt((a-c)*(a-c)+(b-d)*(b-d)));}return 0;
}